Dr David Grimes reviews the evidence of whether higher blood level of Vitamin D can reduce your chance of testing positive for coronavirus and help reduce the severity if you do have it
He shows how Bradford Hill’s criteria – showing cause and effect – have been met
* Strength of association
* Consistency of association
* Time
* Biological gradient
* Plausibility
* Coherence
* Experimentation
* Analogy
He ends with the definitive statement:
“During a pandemic everyone should take a vitamin D supplement”
